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Adding a little vitamin D for 3 months did not help bones of healthy children – Jan 2011

Effects of vitamin D supplementation on bone density in healthy children: systematic review and meta-analysis

1. Tania Winzenberg, senior research fellow in general practice1,
2. Sandi Powell, endocrinologist2,
3. Kelly Anne Shaw, honorary associate and postdoctoral fellow13,
4. Graeme Jones, head of musculoskeletal unit1

+ Author Affiliations

1.Menzies Research Institute, University of Tasmania, Private Bag 23, Hobart, TAS 7000, Australia
2.Royal Hobart Hospital, Liverpool St Hobart, Tasmania
3.ASLaRC Aged Services Unit, Southern Cross University, Coffs Harbour, Queensland Australia
1. Correspondence to: T Winzenberg tania.winzenberg at utas.edu.au
* Accepted 22 November 2010

BMJ 2011; 2011; 342:c7254 doi: 10.1136/bmj.c7254 (Published 25 January 2011)

Objective To determine the effectiveness of vitamin D supplementation for improving bone mineral density in children and adolescents and if effects vary with factors such as vitamin D dose and vitamin D status.

Design Systematic review and meta-analysis.

Data sources Cochrane Central Register of Controlled Trials, Medline (1966 to present), Embase (1980 to present), CINAHL (1982 to present), AMED (1985 to present), and ISI Web of Science (1945 to present), last updated on 9 August 2009, and hand searching of conference abstracts from key journals.

Study selection Placebo controlled randomised controlled trials of vitamin D supplementation for at least three months in healthy children and adolescents (aged 1 month to <20 years) with bone density outcomes. Two authors independently assessed references for inclusion and study quality and extracted data.

Data synthesis Standardised mean differences of the percentage change from baseline in bone mineral density of the forearm, hip, and lumbar spine and total body bone mineral content in treatment and control groups. Subgroup analyses were carried out by sex, pubertal stage, dose of vitamin D, and baseline serum vitamin D concentration. Compliance and allocation concealment were also considered as possible sources of heterogeneity.

Results From 1653 potential references, six studies, totalling 343 participants receiving placebo and 541 receiving vitamin D, contributed data to meta-analyses. Vitamin D supplementation had no statistically significant effects on total body bone mineral content or on bone mineral density of the hip or forearm. There was a trend to a small effect on lumbar spine bone mineral density (standardised mean difference 0.15, 95% confidence interval ?0.01 to 0.31; P=0.07). Effects were similar in studies of participants with high compared with low serum vitamin D levels, although there was a trend towards a larger effect with low vitamin D for total body bone mineral content (P=0.09 for difference). In studies with low serum vitamin D, significant effects on total body bone mineral content and lumbar spine bone mineral density were roughly equivalent to a 2.6% and 1.7% percentage point greater change from baseline in the supplemented group.

Conclusions It is unlikely that vitamin D supplements are beneficial in children and adolescents with normal vitamin D levels. The planned subgroup analyses by baseline serum vitamin D level suggest that vitamin D supplementation of deficient children and adolescents could result in clinically useful improvements, particularly in lumbar spine bone mineral density and total body bone mineral content, but this requires confirmation.

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Comment:

  • Very unlikely that such low doses of vitamin D should show any result at all, much less in 3 months.
    • 200 IU, 400 IU, 800IU, 2000 IU
  • No mention of adding co-factors which are essential for vitamin D to build strong bones
    • Calcium, Magnesium, Vitamin K2, Boron, Silicon, Strontium, etc.

See also VitaminDWiki

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